How to Import CSV split by Tab Interop Excel

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C#

MS-Excel

interop

CSV

Hello,
I've got a Problem with importing a CSV file to Excel via C#.
I've got 2 different types of CSV files, the first one is delimitered by commas and the import works perfectly fine, the second type is delimitered by tabstops and is not working. I can't find any mistake so I hope you are going to find a solution:

Code for Importing comma file:

// Create new Excel-Application and initialize the Worksheet and the Range //
                Microsoft.Office.Interop.Excel.Application xl = new Microsoft.Office.Interop.Excel.Application();

                Microsoft.Office.Interop.Excel.Worksheet xSheet;
                Microsoft.Office.Interop.Excel.Range xRange;

                // Import CSV and split at Comma //
                xl.Workbooks.OpenText(tbDS.Text,
                   false, 3,
                   Excel.XlTextParsingType.xlDelimited,
                   Excel.XlTextQualifier.xlTextQualifierNone,
                   Type.Missing, Type.Missing, Type.Missing, true,
                   Type.Missing, Type.Missing, Type.Missing,
                   Type.Missing, Type.Missing, Type.Missing,
                   Type.Missing, Type.Missing, Type.Missing);

Code for Importing tab file:

string file = Path.GetDirectoryName(tbDS.Text) + "\\Measurements\\" + report + ".csv";
            if (File.Exists(file))
            {
              // Create new Excel-Application and initialize the Worksheet and the Range //
              Microsoft.Office.Interop.Excel.Application xl = new Microsoft.Office.Interop.Excel.Application();

              Microsoft.Office.Interop.Excel.Worksheet xSheet;
              Microsoft.Office.Interop.Excel.Range xRange;

              // Import CSV and split at Tab-Stop //
              xl.Workbooks.OpenText(file,
                 false, 3,
                 Excel.XlTextParsingType.xlDelimited,
                 Excel.XlTextQualifier.xlTextQualifierNone,
                 Type.Missing, true, Type.Missing, Type.Missing, 
                 Type.Missing, Type.Missing, Type.Missing,
                 Type.Missing, Type.Missing, Type.Missing, 
                 Type.Missing, Type.Missing, Type.Missing);

First one splits the CSV perfectly fine, second one does not split the CSV File

Sample CSV:
comma:

Testplan, Load, RFV1, 1HAR1, RFV2, 1HAR2, RR, LRU, LRL, TUZ(pp), TUZ(har), Total grade, date + time,
434, 6326, 59, 19, 0, 0, 0.249, 1.108, 0.66, 17.3, 0, 1,  7. 05. 2014 08:54:09,
434, 6334, 129, 95, 0, 0, 0.352, 1.449, 0.931, 27.8, 0, 4,  7. 05. 2014 08:54:25,
434, 6301, 41, 23, 0, 0, 0.129, 1.032, 0.631, 14.5, 0, 1,  7. 05. 2014 08:54:40,
434, 6317, 76, 34, 0, 0, 0.248, 1.011, 0.774, 18, 0, 1,  7. 05. 2014 08:54:57,

tab:

RKS1	RKS2	LKS1	LKS2	HS	SSO	SSU
6	0	2	0	-47	0	-44
6	0	2	0	-49	1	-48
6	0	2	0	-50	2	-54
6	0	2	0	-51	3	-60
6	0	2	0	-52	5	-66
6	0	1	0	-54	5	-70

Thank you in Advance